A184596 - OEIS

A184596

1/4 the number of (n+1) X 2 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.

2, 5, 16, 58, 214, 784, 2880, 10704, 40264, 152728, 582424, 2229856, 8566528, 33011680, 127553920, 493989568, 1916920384, 7451582080, 29011376256, 113108257920, 441536615296, 1725575305600, 6750738252160, 26435046548992

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 1 of A184604.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 3 X 2:

..0..1....0..0....1..1....1..1....0..0....1..1....1..0....0..0....0..0....1..0

..0..1....1..1....1..1....1..0....1..0....0..1....0..1....0..0....1..1....1..0

..1..0....1..1....1..1....0..0....1..1....0..0....0..1....1..1....0..0....0..1

CROSSREFS

Sequence in context: A348103 A184943 A286946 * A149978 A212263 A149979

Adjacent sequences: A184593 A184594 A184595 * A184597 A184598 A184599

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2011

STATUS

approved